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Workers clean Grand Canyon Skywalk, Arizona

A technician from Abseilon USA works to clean more than 40 panes of glass underneath the horseshoe-shaped bridge at the Grand Canyon Skywalk in Arizona in this handout picture courtesy of George & Pat Walsh of GPWalshPhotography.com, taken March 24, 2014. REUTERS/George & Pat Walsh of GPWalshPhotography.com/Handout via Reuters